Head holder



FIG. 1 is a front-right perspective view of a head holder according to the claimed design.

FIG. 2 is a rear-left perspective view of the head holder.

FIG. 3 is a front view of the head holder.

FIG. 4 is a rear view of the head holder.

FIG. 5 is a left side view of the head holder.

FIG. 6 is a right side view of the head holder.

FIG. 7 is a top view of the head holder; and,

FIG. 8 is a bottom view of the head holder.

The dash-dash broken lines in the drawings illustrate portions of the head holder that form no part of the claimed design. 

CLAIM The ornamental design for a head holder, as shown and described. 